The Price of Undeliverable Mail for Online Retailers
When the recipient is unavailable or has relocated without providing a forwarding address, or when the recipient's address is inaccurate, partial, or unreadable, the mail is considered undeliverable. If at all possible, such correspondence is usually sent back to the sender. It may be kept, destroyed, or handled in accordance with postal regulations if a return is not possible. The integrity of postal services is preserved and appropriate mail flow is ensured by handling undeliverable mail. https://tinyurl.com/4zh8tzjx